package net.bwie.realtime.jtp.dwd.log.function;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import net.bwie.realtime.jtp.utils.DateTimeUtil;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

/**
 * 使用状态state编程，对is_new字段值进行校验和纠偏
 */
public class AdjustIsNewProcessFunction extends KeyedProcessFunction<String, String, String> {
    //step1.声明状态
    private transient ValueState<String> firstDateState=null;

    @Override
    public void open(Configuration parameters) throws Exception {
        //step2.初始化状态
        firstDateState = getRuntimeContext().getState(
                new ValueStateDescriptor<String>("first-date", String.class)
        );
    }

    @Override
    public void processElement(String value, Context ctx, Collector<String> out) throws Exception {
        //step3.获取状态值
        String firstDate = firstDateState.value();

        //解析字段值
        JSONObject jsonObject = JSON.parseObject(value);
        String isNewValue = jsonObject.getJSONObject("common").getString("is_new");
        Long tsValue = jsonObject.getLong("ts");

        //todo isNew=1  firstDate=null firstDate=有值
        if ("1".equals(isNewValue)){
            if (null==firstDate){
                //step4.更新状态值
                //此时is_new正确，状态值更新为第一次访问日期
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue,DateTimeUtil.DATE_FORMAT));
            }
            else {
                //状态值（首次访问日期）等于数据日期，不做处理
                if (!firstDate.equals(DateTimeUtil.convertLongToString(tsValue,DateTimeUtil.DATE_FORMAT))){
                    jsonObject.getJSONObject("common").put("is_new","0");
                }
            }
        }else {
            if (null==firstDate){
                firstDateState.update(DateTimeUtil.convertLongToString(tsValue-86400000,DateTimeUtil.DATE_FORMAT));
            }
        }
        //输出数据
        out.collect(jsonObject.toJSONString());
    }


}
